JPH097325A - Magnetic head - Google Patents

Abstract

(57) [Abstract] [Purpose] An object of the present invention is to provide a magnetic head having a stable recording / reproducing characteristic with good parallelism between the ski surface and the gimbal surface without lowering the positional accuracy of the magnetic head with respect to the gimbal. A composite magnetic core 2 in which a recording / reproducing core and an erasing core are joined is provided with a slider 4 fixedly supported by a non-magnetic ceramic 3 and a gimbal 9 for supporting the slider 4, and the gimbal 9 is a slider. 4 has a protrusion 21 on the side of the surface to be bonded to 4, and one side surface of the protrusion 21 is in contact with one side surface of the magnetic core 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a magnetic head mainly used in a flexible disk drive device.

[0002]

2. Description of the Related Art In flexible disk drive devices,
An example of a magnetic head conventionally used will be described with reference to FIGS. 7 and 8.

In FIG. 7, a magnetic head 1 has a slider 4 in which a magnetic core 2 is fixedly supported by non-magnetic ceramics 3.
The recording / reproducing coil 5, the erasing coil 6, and the back core 7.

Although a core shield material is actually attached around the magnetic head 8, it is omitted for simplification of description.

The structure of the magnetic head shown in FIG. 7 will be described in detail with reference to FIG. In FIG. 8, reference numeral 1 is a magnetic core, and a recording / reproducing head 11 having a recording / reproducing magnetic gap 10.
And an erasing head 13 having an erasing magnetic gap 12
And are joined together. The magnetic core 2 is fixed to the side surface of the non-magnetic ceramic 3 to form the slider 4.

The slider 4 has a magnetic gap 1 for recording and reproduction.
0, after the depth of the erasing magnetic gap 12 is regulated to a desired depth, the bottom surface 16 of the foot 15 of the magnetic core 2 is closer to the ski surface 18 than the bottom surface 17 of the nonmagnetic ceramic 3. It is processed so that the distance becomes longer. Then, the recording / reproducing coil 5 and the erasing coil 6 are inserted into the foot 15, the back core 7 is attached, and the magnetic core 2 is magnetically closed.

The magnetic head 1 is constructed such that the bottom surface 17 of the non-magnetic ceramic 3 is adhered and fixed to the gimbal 9 made of a thin metal plate with a resin.

Next, a method of positioning when the magnetic head 1 is bonded and fixed onto the gimbal 9 which is performed by the conventional magnetic head 1 will be described with reference to FIGS. 9 and 10. The position of the magnetic head 1 with respect to the gimbal 9 is defined by the position of the magnetic gap with respect to the gimbal 9.

FIG. 9 is a bottom view of the conventional magnetic head as viewed from the back side of the gimbal, and FIG. 10 is a side view of the conventional magnetic head, and the coil is omitted in FIG.

As shown in FIG. 9, the gimbal 9 used in the conventional magnetic head 1 is provided with a positioning hole 22 in the vicinity of the bonding portion with the slider, and the positioning hole 22 is formed after the magnetic head is bonded. A part of the side surrounded by the broken line portions d, e, f is in contact with the foot 15. When viewed from the side, the magnetic head has a bottom surface 17 of the non-magnetic ceramic 3 as shown in FIG.
Is fixedly supported by the gimbal 9, and the foot 15 projects to the back surface side of the gimbal 9 through the hole 22 of the gimbal 9.

The positions of the holes 22 are determined by the broken lines d, e, f in FIG.
The magnetic gap is determined so as to be at a prescribed position on the gimbal 9 when the foot 15 contacts each side surrounded by the line. The side surrounded by the broken lines d and f is perpendicular to the running direction of the magnetic head. The position in the direction is determined, and the position of the magnetic gap in the traveling direction of the magnetic head is restricted by the side surrounded by the broken line portion e.

The positioning of the magnetic head 1 with respect to the gimbal 9 is performed by attaching one side surface of the foot 15 to the hole 2 when adhering to the gimbal 9.
It is performed by pressing against each side surrounded by the broken line portions d, e, and f of 2. In the conventional magnetic head, in order to perform the above-described magnetic head positioning method, in the slider 4 of FIG. 8, the bottom surface 16 of the foot 15 is more distant from the ski surface than the bottom surface 17 of the non-magnetic ceramic 3. Must be in a distant position.

Next, a method of shaping the slider 4 will be described with reference to FIG. 11 showing a side surface of the slider 4 before the shaping. After the magnetic core 2 is bonded to the side surface of the non-magnetic ceramics 3, first, the bottom surface 16 of the foot 15 and the temporary bottom surface of the non-magnetic ceramics 3 are processed to be flush with each other, as indicated by the broken line a.

Next, with reference to the surface indicated by the broken line a, the ski surface indicated by the broken line b is processed to regulate the depth of the magnetic gap. Finally, as shown by the broken line c, the bottom surface 17 of the nonmagnetic ceramics 3 is cut,
The nonmagnetic ceramic 3 is regulated to a desired height. The processing indicated by the broken line c is performed not with the ski surface but with the side surface 23 of the magnetic core 2 as the reference surface in order to protect the ski surface.

[0015]

In the conventional magnetic head, since the position of the magnetic core is directly regulated by the positioning hole provided on the gimbal without using a jig, the position of the magnetic gap with respect to the gimbal is reduced. The position can be accurately determined.

However, in order to realize the above-described positioning method, in the conventional magnetic head, the height of the bottom surface of the foot of the magnetic core viewed from the ski surface is more than the height of the bottom surface of the non-magnetic ceramic viewed from the ski surface. Had to be higher.

For this reason, although the slider is shaped as described above, the ski surface and the bottom surface of the non-magnetic ceramic have different reference planes for processing, and the ski surface is machined from the bottom surface of the magnetic core. The cutting of the bottom surface of the non-magnetic ceramic is performed using the side surfaces of the magnetic core as reference surfaces.

However, since the bottom surface and the side surface of the magnetic core are not necessarily vertical, the parallelism between the ski surface after the slider shape processing and the bottom surface of the non-magnetic ceramic may not be sufficient.

On the other hand, since the magnetic core is bonded to the gimbal on the bottom surface of the non-magnetic ceramic, if the parallelism between the ski surface and the bottom surface of the non-magnetic ceramic is not sufficient, as a result, the parallelism between the gimbal surface and the ski surface will be increased. It will get worse. Here, the magnetic head makes contact with the magnetic recording medium on the ski surface, but since the magnetic recording medium surface is parallel to the gimbal surface, if the parallelism between the gimbal surface and the ski surface is not sufficient, the In some cases, the contact state of the magnetic recording medium deteriorates, a gap is formed between the ski surface and the magnetic recording medium, and the recording / reproducing characteristics of the magnetic head deteriorate. Therefore, for such a reason, the conventional magnetic head has a problem that the recording / reproducing characteristics may be deteriorated due to the positioning method.

Therefore, it is an object of the present invention to provide a magnetic head in which the positional accuracy of the magnetic head with respect to the gimbal does not deteriorate, the ski surface and the gimbal surface have good parallelism, and the recording / reproducing characteristics are stable.

[0021]

The magnetic head of the present invention comprises:
A composite magnetic core in which a recording / reproducing core and an erasing core are joined together is provided with a slider fixedly supported by non-magnetic ceramics and a gimbal for supporting the slider, and the gimbal has a protrusion on the adhesive surface side with the slider. Then, one side surface of the protrusion is in contact with one side surface of the magnetic core.

[0022]

With the above structure, the positioning of the magnetic head with respect to the gimbal is performed by directly controlling the position of the magnetic core by the protrusion provided on the gimbal. Since the position of the magnetic head with respect to the gimbal is defined by the position of the magnetic gap with respect to the gimbal, if the position of the protrusion is defined with the magnetic gap as a reference, the position can be regulated with high accuracy as in the conventional magnetic head.

On the other hand, since it is not necessary for the magnetic core to penetrate the gimbal, it is not necessary to cut the bottom surface of the non-magnetic ceramic after the magnetic gap depth is regulated. In this case, the bottom surface of the foot of the magnetic core and the bottom surface of the non-magnetic ceramic can be installed on the same plane, and the ski surface for the magnetic gap depth regulation is processed with this surface as a reference. Therefore, when processing the ski surface, the bottom surface of the nonmagnetic ceramic is included in the reference surface for processing, and the parallelism between the ski surface and the bottom surface of the nonmagnetic ceramic is improved.
Since the magnetic head is bonded to the gimbal on the bottom surface of the non-magnetic ceramic, the parallelism between the ski surface and the bottom surface of the non-magnetic ceramic is improved, and thus the parallelism between the gimbal surface and the ski surface of the magnetic head is also improved. Since the surface of the magnetic recording medium is parallel to the gimbal surface, the parallelism between the gimbal surface and the ski surface can improve the contact state between the magnetic head and the magnetic recording medium, and as a result, the recording / reproducing characteristics of the magnetic head can be maintained well. can do.

[0024]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention. It should be noted that the same components as those shown in FIGS. 7 to 11 showing the conventional configuration will be designated by the same reference numerals and the description thereof will be omitted.

The structure of the magnetic head of this embodiment will be described in detail with reference to FIG. The magnetic core 2 is made of a ferrite material having high magnetic permeability, and is constituted by joining a recording / reproducing head 11 having a recording / reproducing magnetic gap 10 and an erasing head 13 having an erasing magnetic gap 12. The non-magnetic ceramics 3 is mainly made of calcium titanate, and has grooves 14 for inserting the recording / reproducing coil and the erasing coil 6 on the side where the magnetic core is bonded.

In the magnetic head of this embodiment, the bottom surface 16 of the foot 15 of the magnetic core 2 and the bottom surface 17 of the non-magnetic ceramic 3 are machined so as to be flush with each other. 10. The slider 4 is constructed by limiting the depth of the erasing magnetic gap 12 to a desired depth.

After the recording / reproducing coil 5 and the erasing coil 6 are inserted in the groove 14 for coil insertion, the back core 7 is attached to form the magnetic head 8 shown in FIG. The magnetic head 1 of the present embodiment is constructed by bonding and fixing the bottom surface 17 of 3 on the gimbal 9 made of a thin metal plate with resin.

Next, a method of shaping the slider 4 used in the magnetic head of this embodiment will be described with reference to FIG. 3 showing a side surface of the slider. After the magnetic core 2 is adhered to the side surface of the non-magnetic ceramics 3, first, the bottom surface 16 of the foot 15 and the bottom surface 17 of the non-magnetic ceramics 3 are processed to be flush with each other, as indicated by the broken line a in FIG. .

Next, with reference to the surface indicated by the broken line a, the ski surface indicated by the broken line b in FIG. 3 is processed to regulate the depth of the magnetic gap. The broken line a is the broken line a and the broken line b
Is positioned so as to be the same as the desired height of the non-magnetic ceramics 3, and the non-magnetic ceramics 3 is also regulated to the desired height by the ski surface machining of the broken line b, and the shape of the slider is determined.

The gimbal 9 of this embodiment will be described with reference to FIGS. 4 and 5. FIG. 4 is a bottom view of the gimbal in one embodiment of the present invention as seen from the ski side of the magnetic head, and FIG. 5 is a side view of the gimbal in one embodiment of the present invention.

Similar to the conventional magnetic head, the gimbal 9 of this embodiment is provided with a hole 19 for temporarily adhering the magnetic head 1 and the gimbal 9 and a conductive resin for electrically connecting the gimbal 9 and the magnetic head 1 to each other. It has a hole for it.

Further, the gimbal 9 of this embodiment is provided with a protrusion 21 for restricting the position of the magnetic head 1, and the position thereof is determined with reference to the magnetic gap position. The feet 15 are located at the positions shown by the broken lines in FIG. 4, and contact the projections 21 on one side as shown in the drawing, so that the gimbal 9 of the magnetic head 1 can be used for the same reason as the conventional magnetic head.
The position with respect to is restricted.

FIG. 6 is a side view showing the positional relationship between the gimbal and the slider in one embodiment of the present invention, and the coil is omitted. In the magnetic head 1 of the present embodiment, the bottom surface 16 of the foot 15 of the magnetic core 2 and the bottom surface 17 of the non-magnetic ceramic 3 are on the same plane, and the magnetic core 2 is The gimbal 9 is in contact with only the side surface portion adjacent to the bottom surface 16 and the protrusion 21.

As described above, in the magnetic head 1 of the present embodiment, the position of the magnetic core 2 is directly regulated by the protrusion 21 provided on the gimbal 9 to position the magnetic head 1. Therefore, similar to the conventional example. The position of the magnetic gap with respect to the gimbal 9 is accurately regulated.

In this embodiment, a resin is applied onto the gimbal 9 having a specified thickness, and only the resin portion is ion-etched, and the magnetic head 1 travels on the gimbal 9 in the traveling direction at a maximum length of 0.7 mm. The maximum length in the direction perpendicular to the direction is 0.
A protrusion having a size of 6 mm and a height from the gimbal surface of 0.1 mm was prepared.

As a result, since the ion beam used for etching has a high directivity and the projections are rectangular parallelepipeds, the side surfaces of the projections can come into contact with the side surfaces of the magnetic core when positioning the magnetic head 1 with good accuracy. Can be positioned. Further, when the magnetic head 1 was actually manufactured using this gimbal 9, the standard deviation σ of the displacement amount of the magnetic gap position was 0.01 mm in the conventional magnetic head, whereas in the present embodiment. Even in the magnetic head 1, it is 0.01 mm,
The position accuracy was the same.

On the other hand, in the magnetic head 1 of this embodiment, it is not necessary for the magnetic core 2 to penetrate the gimbal 9 by using the gimbal described above. Therefore, it is not necessary to cut the bottom surface 17 of the non-magnetic ceramics 3 after the ski surface processing, which has been performed in the conventional magnetic head, and the number of steps can be reduced.

The bottom surface 16 of the foot 15 of the magnetic core 2
And the bottom surface 17 of the non-magnetic ceramic 3 are placed on the same plane, and the ski surface for restricting the depth of the magnetic gap is processed with this surface as a reference. Therefore, when processing the ski surface, the non-magnetic ceramic 3
Since the bottom surface 17 is included, the parallelism between the ski surface and the bottom surface 17 of the nonmagnetic ceramic 3 is improved.

Since the magnetic head 1 is bonded to the gimbal 9 by the bottom surface 17 of the non-magnetic ceramic 3, the ski surface 18 is formed.
If the parallelism of the bottom surface 17 of the nonmagnetic ceramic 3 is improved, the parallelism of the gimbal surface and the ski surface of the magnetic head 1 is also improved.

Actually, the height difference from the gimbal surface to the ski surface in one head was 20 μm at maximum in the conventional magnetic head, but was about 10 μm at maximum in the manufactured magnetic head of this embodiment. Improved. As a result,
Almost no modulation of the reproducing output of the magnetic head, which is caused by poor contact between the ski surface and the magnetic recording medium, was observed.

With the structure as described above, the magnetic head 1 of the present invention has the same positional accuracy with respect to the gimbal 9 as the conventional magnetic head, and the ski surface and the gimbal surface have good parallelism and stable recording / reproducing. The characteristics are obtained.

In the gimbal used in the conventional magnetic head, a hole for positioning the magnetic head is formed by punching, but a burr generated at that time is left as a protrusion for positioning the magnetic head. Is also good.

[0043]

In the magnetic head of the present invention, the position of the magnetic head with respect to the gimbal is regulated by directly contacting the magnetic core with the protrusion provided on the gimbal, so that the positioning method is the same as that of the conventional magnetic head and the accuracy is high. Good position regulation can be done. On the other hand, the bottom surface of the foot of the magnetic core and the bottom surface of the non-magnetic ceramic can be made flush with each other, and the ski surface of the magnetic head is machined and adhered to the gimbal using this surface as a reference plane. The parallelism between the gimbal surface of the head and the ski surface is improved. Since the surface of the magnetic recording medium is parallel to the gimbal surface, the improved parallelism between the gimbal surface and the ski surface improves the contact state between the magnetic head and the magnetic recording medium and stabilizes the recording / reproducing characteristics of the magnetic head.

[Brief description of drawings]

FIG. 1 is a perspective view of a magnetic head according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of a magnetic head according to an embodiment of the present invention.

FIG. 3 is an explanatory view of a magnetic head processing step according to an embodiment of the present invention.

FIG. 4 is a bottom view of the gimbal in one embodiment of the present invention as seen from the ski surface side of the magnetic head.

FIG. 5 is a side view of a gimbal according to an embodiment of the present invention.

FIG. 6 is a side view showing a positional relationship between a gimbal and a slider according to an embodiment of the present invention.

FIG. 7 is a perspective view of a conventional magnetic head.

FIG. 8 is an exploded perspective view of a conventional magnetic head.

FIG. 9 is a bottom view of a conventional magnetic head seen from the back side of the gimbal.

FIG. 10 is a side view of a conventional magnetic head.

FIG. 11 is an explanatory view of a conventional magnetic head processing step.

[Explanation of symbols]

 1 magnetic head 2 magnetic core 3 non-magnetic ceramics 4 slider 5 recording / reproducing coil 6 erasing coil 7 back core 8 magnetic head 9 gimbal

Claims (1)

[Claims] 1. A slider comprising a composite magnetic core, in which a recording / reproducing core and an erasing core are joined, fixedly supported by non-magnetic ceramics, and a gimbal for supporting the slider, wherein the gimbal is the slider. A magnetic head having a protrusion on the adhesive surface side thereof, wherein one side surface of the protrusion is in contact with one side surface of the magnetic core.